4 files changed, 220 insertions, 0 deletions

diff --git a/src/client/games/blackjack.rs b/src/client/games/blackjack.rs
new file mode 100644
index 0000000..a34eb63
--- /dev/null
+++ b/src/client/games/blackjack.rs
@@ -0,0 +1,148 @@
+use super::traits::{Game, GameState};
+use crate::blackjack::{card_label, BlackjackState};
+
+pub const BLACKJACK_BOARD_LINES: usize = 6;
+
+pub struct BlackjackGame;
+
+impl BlackjackGame {
+    pub fn new() -> Self {
+        Self
+    }
+
+    fn state(state: &GameState) -> Option<BlackjackState> {
+        state
+            .data
+            .get("blackjack")
+            .and_then(|raw| serde_json::from_str(raw).ok())
+    }
+
+    fn cards(cards: &[String]) -> String {
+        cards
+            .iter()
+            .map(|card| {
+                if card == "?" {
+                    "[ ? ]".to_string()
+                } else {
+                    format!("[{}]", card_label(card))
+                }
+            })
+            .collect::<Vec<_>>()
+            .join(" ")
+    }
+
+    fn result_text(result: &str, winnings: u64) -> String {
+        match result {
+            "blackjack" => format!("BLACKJACK! Won {winnings} PLN"),
+            "win" => format!("Win! Won {winnings} PLN"),
+            "push" => "Push. Bet returned.".to_string(),
+            "lose" => "Dealer wins.".to_string(),
+            "bust" => "Bust.".to_string(),
+            "cancelled" => "Cancelled.".to_string(),
+            _ => "Hand complete.".to_string(),
+        }
+    }
+}
+
+impl Game for BlackjackGame {
+    fn get_name(&self) -> &'static str {
+        "Blackjack"
+    }
+
+    fn render(&self, state: &GameState) -> String {
+        let status = state
+            .data
+            .get("status")
+            .map(String::as_str)
+            .unwrap_or("ready");
+        let balance = state
+            .data
+            .get("balance")
+            .map(String::as_str)
+            .unwrap_or("?");
+        let hand = Self::state(state);
+
+        if let Some(error) = state.data.get("error") {
+            let bet = hand.as_ref().map(|hand| hand.bet).unwrap_or(state.bet_amount);
+            return format!(
+                "=== BLACKJACK ===\r\nBalance: {balance} PLN   Bet: {bet} PLN\r\n\r\n\r\nERROR: {error}\r\n[Q] Quit"
+            );
+        }
+
+        let (dealer, dealer_total, player, player_total, bet, text, controls) =
+            if let Some(hand) = &hand {
+                let bet = if status == "player" {
+                    hand.bet
+                } else {
+                    state.bet_amount
+                };
+                let text = match status {
+                    "player" => {
+                        if hand.actions.iter().any(|action| action == "double") {
+                            "Hit, stand or double.".to_string()
+                        } else {
+                            "Hit or stand.".to_string()
+                        }
+                    }
+                    "dealing" => "Dealing...".to_string(),
+                    "cancelling" => "Cancelling...".to_string(),
+                    "done" => Self::result_text(&hand.result, hand.winnings),
+                    _ => "Press [SPACE] to deal.".to_string(),
+                };
+                let controls = if status == "player" {
+                    if hand.actions.iter().any(|action| action == "double") {
+                        "[H]it [S]tand [D]ouble [Q]uit".to_string()
+                    } else {
+                        "[H]it [S]tand [Q]uit".to_string()
+                    }
+                } else {
+                    "[SPACE] New hand   [+/-] Bet   [Q] Quit".to_string()
+                };
+                (
+                    Self::cards(&hand.dealer),
+                    hand.dealer_total,
+                    Self::cards(&hand.player),
+                    hand.player_total,
+                    bet,
+                    text,
+                    controls,
+                )
+            } else {
+                (
+                    "—".to_string(),
+                    0,
+                    "—".to_string(),
+                    0,
+                    state.bet_amount,
+                    "Press [SPACE] to deal.".to_string(),
+                    "[SPACE] Deal   [+/-] Bet   [Q] Quit".to_string(),
+                )
+            };
+
+        format!(
+            "=== BLACKJACK ===\r\nBalance: {} PLN   Bet: {} PLN\r\nDealer: {}   {}\r\nYou:    {}   {}\r\n{}\r\n{}",
+            balance, bet, dealer, dealer_total, player, player_total, text, controls
+        )
+    }
+
+    fn render_lines(&self, _state: &GameState) -> usize {
+        BLACKJACK_BOARD_LINES
+    }
+
+    fn get_help(&self) -> String {
+        "BLACKJACK\n\
+        =========\n\
+        Six-deck shoe, fresh for every hand.\n\
+        Dealer stands on all 17s.\n\
+        Blackjack pays 3:2.\n\
+        Double is allowed on the first two cards.\n\
+        \n\
+        H - hit\n\
+        S - stand\n\
+        D - double (when available)\n\
+        SPACE - deal a new hand\n\
+        +/- - change the next hand's bet\n\
+        Q - leave the table"
+            .to_string()
+    }
+}
diff --git a/src/client/games/manager.rs b/src/client/games/manager.rs
index 02e9451..4e0218b 100644
--- a/src/client/games/manager.rs
+++ b/src/client/games/manager.rs
@@ -1,7 +1,9 @@
+use super::blackjack::BlackjackGame;
 use super::response::{RouletteResult, SpinResult};
 use super::roulette::RouletteGame;
 use super::slots::SlotsGame;
 use super::traits::{Game, GameError, GamePhase, GameState};
+use crate::blackjack::BlackjackState;
 use crate::roulette::Bets;
 use std::collections::HashMap;
 
@@ -15,6 +17,7 @@ impl GameManager {
         let mut games: HashMap<String, Box<dyn Game>> = HashMap::new();
         games.insert("slots".to_string(), Box::new(SlotsGame::new()));
         games.insert("roulette".to_string(), Box::new(RouletteGame::new()));
+        games.insert("blackjack".to_string(), Box::new(BlackjackGame::new()));
 
         Self {
             current_session: None,
@@ -51,6 +54,9 @@ impl GameManager {
             data.insert("status".to_string(), "place".to_string());
             data.insert("number_input".to_string(), String::new());
             0
+        } else if game_type == "blackjack" {
+            data.insert("status".to_string(), "ready".to_string());
+            10
         } else {
             10
         };
@@ -260,6 +266,49 @@ impl GameManager {
             .insert("number_input".to_string(), String::new());
     }
 
+    pub fn apply_blackjack_state(&mut self, state: BlackjackState) {
+        let Some(session) = self.current_session.as_mut() else {
+            return;
+        };
+        session.phase = if state.phase == "player" {
+            GamePhase::Playing
+        } else {
+            GamePhase::Finished
+        };
+        session.bet_amount = state.base_bet;
+        session.data.remove("error");
+        session
+            .data
+            .insert("balance".to_string(), state.balance.to_string());
+        session.data.insert(
+            "status".to_string(),
+            if state.phase == "player" {
+                "player".to_string()
+            } else {
+                "done".to_string()
+            },
+        );
+        session.data.insert(
+            "blackjack".to_string(),
+            serde_json::to_string(&state).unwrap_or_default(),
+        );
+    }
+
+    pub fn blackjack_state(&self) -> Option<BlackjackState> {
+        self.current_session
+            .as_ref()
+            .and_then(|session| session.data.get("blackjack"))
+            .and_then(|raw| serde_json::from_str(raw).ok())
+    }
+
+    pub fn set_blackjack_status(&mut self, status: &str) {
+        if let Some(session) = self.current_session.as_mut() {
+            session
+                .data
+                .insert("status".to_string(), status.to_string());
+        }
+    }
+
     pub fn get_current_game(&self) -> Option<&dyn Game> {
         self.current_session
             .as_ref()
diff --git a/src/client/games/mod.rs b/src/client/games/mod.rs
index 131ffbb..40ba32a 100644
--- a/src/client/games/mod.rs
+++ b/src/client/games/mod.rs
@@ -1,3 +1,4 @@
+pub mod blackjack;
 pub mod manager;
 pub mod response;
 pub mod roulette;
diff --git a/src/client/games/response.rs b/src/client/games/response.rs
index 73080dd..d9883f7 100644
--- a/src/client/games/response.rs
+++ b/src/client/games/response.rs
@@ -141,3 +141,25 @@ pub fn parse_roulette_response(response: &str) -> Result<RouletteResult, String>
         bets,
     })
 }
+
+pub fn parse_blackjack_response(
+    response: &str,
+) -> Result<crate::blackjack::BlackjackState, String> {
+    let response = response.trim();
+    if response.is_empty() {
+        return Err("No response from server".to_string());
+    }
+    if let Some(message) = response.strip_prefix("ERROR") {
+        let message = message.trim();
+        return Err(if message.is_empty() {
+            "Server error".to_string()
+        } else {
+            message.to_string()
+        });
+    }
+
+    let raw = response
+        .strip_prefix("BLACKJACK_STATE ")
+        .ok_or_else(|| format!("Unexpected server response: {response}"))?;
+    serde_json::from_str(raw).map_err(|error| format!("Invalid blackjack state: {error}"))
+}